Solution :
t /2,df = 1.711
Margin of error = E = t/2,df * (s /n)
= 1.711 * (40000 / 25)
Margin of error = E = 13688
The 95% confidence interval estimate of the population mean is,
- E < < + E
195000 - 13688 < < 195000 + 13688
181312 < < 208688
CI is : 181312 to 208668
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